Beginning with model year 2008, Light truck manufacturers have the option to comply with the unreformed standard values or the new reformed standard values based upon each manufacturers unique vehicle fleet characteristics. In model years 2008-2010, the values shown for CAFE standards for Light truck are the standard values applicable under the existing "unreformed" CAFE program.

Average U.S. passenger car fuel efficiency (calendar year) data for 2007-09 are based on a new FHWA methodology and are not comparable to previous years in this table. The vehicle categories also only apply to 2007-09; Light duty vehicle, short wheel base replaces Passenger car and Lighty duty vehicle, long wheel base replaces Other 2-axle 4-tire vehicle for previous years.

SOURCES: Average U.S. passenger car fuel efficiency: Federal Highway Administration; New vehicle fuel efficiency (based on model year production) and CAFE standards: National Highway Traffic Safety Administration as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 4-23, available at http://www.rita.dot.gov/bts/publications as of January 2013.